Deagglomeration of fine granular materials under low-frequency vertical harmonic vibration

2021 ◽  
Author(s):  
Buhan Liu ◽  
Xiaopeng Wang
Keyword(s):  
Granular Materials ◽  
Low Frequency ◽  
Harmonic Vibration

EXPERIMENTAL STUDY OF ENERGY ABSORPTION PROPERTIES OF GRANULAR MATERIALS UNDER LOW FREQUENCY VIBRATIONS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2708-2712
Author(s):  
MAO-BIN HU ◽  
XIANG-ZHAO KONG ◽  
QING-SONG WU ◽  
ZHEN-GANG ZHU
Keyword(s):  
Experimental Study ◽  
Granular Materials ◽  
Energy Absorption ◽  
Vibration Frequency ◽  
Absorption Rate ◽  
Low Frequency ◽  
Vibration Energy ◽  
Torsion Pendulum ◽  
Absorption Properties ◽  
Low Frequency Vibration

The low frequency vibration energy absorption properties of granular materials have been investigated on an Invert Torsion Pendulum (ITP). The energy absorption rate of granular material changes nonlinearly with amplitude under low frequency vibration. The frequency of ITP system increases a little with granular materials in the holding cup. The vibration frequency of ITP system does not change with time.

Vibration-Induced Loosening and Tightening of Threaded Fasteners

1995 ◽  
Author(s):  
Daniel P. Hess
Keyword(s):  
Dynamic Model ◽  
Nonlinear Interaction ◽  
Low Frequency ◽  
Harmonic Vibration ◽  
Static Equilibrium ◽  
Equilibrium Conditions ◽  
System Parameters ◽  
Threaded Fasteners

Abstract Previous analyses of threaded fasteners under vibration are based on static equilibrium conditions with supporting data limited to low frequency loading. Such analyses predict only a net loosening action. This paper presents a dynamic model of a single-bolt assembly with moderate pre-load subjected to axial harmonic vibration. Simulations with this model predict that threaded fasteners can, on the average, loosen or tighten in the presence of vibration; and that the applied vibration, as well as other system parameters, can be tuned so that either action occurs. The model elucidates the nonlinear interaction of friction and vibration of such systems. Measurements from a single-bolt assembly apparatus are presented and compared with the simulations.

Researches on a roller dempfying properties when vibrating a cutting instrument in a bandsaw equipment

2016 ◽  
Vol 6 (3) ◽  
pp. 202-206
Author(s):  
Чепелева ◽  
Marina Chepeleva ◽  
Чепелев ◽  
Stanislav Chepelev ◽  
Чернышков ◽  
...  
Keyword(s):  
Mathematical Description ◽  
Dynamic Properties ◽  
Superposition Principle ◽  
Low Frequency ◽  
Harmonic Vibration ◽  
Experimental Methodology ◽  
Mathematical Apparatus ◽  
Frequency Range ◽  
New Material ◽  
To Receive

The article deals with the usage of new material – the pressed wood together with modifi-cators to detect the dempfying properties to improve a soothing roller in a bandsaw equipment WoodMizerLT 15. The article stresses the idea of the experimental methodology to receive data for the future, further mathematical description of dynamic properties of the bandsaw equipment in low-frequency range of harmonic vibration. The superposition principle is used for the above-mentioned object, so the mathematical apparatus is limited by arrival.

Novel implementation of natural fibro-granular materials as acoustic absorbers

2018 ◽  
Vol 49 (9-10) ◽  
pp. 311-316 ◽  
Author(s):  
Hasina Mamtaz ◽  
Mohammad Hosseini Fouladi ◽  
Satesh Narayana Namasivayam ◽  
Saadman H Sayed ◽  
Tahani H Sayed ◽  
...  
Keyword(s):  
Granular Materials ◽  
Significant Contribution ◽  
Low Frequency ◽  
Frequency Region ◽  
Acoustic Absorption ◽  
Granular Composite ◽  
Absorption Performance ◽  
Predicted Values ◽  
Analytical Tools ◽  
Good Agreement

In this study, a new innovative fibro-granular composite was prepared as a natural acoustic material by combining fibrous and granular materials. Delany–Bazley model and Biot–Allard techniques were utilized to estimate the absorption coefficient of the developed composite material. The predicted values were validated through an analytical outcome employing Johnson–Champoux–Allard technique and an experimentally measured value which were conducted in an impedance tube. The outcomes showed the reflection of the good agreement between the analytical and experimental methods. The current research concluded that the introduction of granular materials provides significant contribution in enhancing the surface area within the composite, thereby achieving a promising acoustic absorption in the low-frequency region which is below 1 kHz. In addition, the current research also reports that, like Johnson–Champoux–Allard model, Delany–Bazley and Biot–Allard models are also two efficient analytical tools for predicting the significant low-frequency acoustic absorption performance of a fibro-granular composite.

Dynamic Loosening and Tightening of a Single-Bolt Assembly

1997 ◽  
Vol 119 (3) ◽  
pp. 311-316 ◽  
Author(s):  
D. P. Hess ◽  
S. V. Sudhirkashyap
Keyword(s):  
Dynamic Model ◽  
Low Frequency ◽  
Harmonic Vibration ◽  
Static Equilibrium ◽  
Equilibrium Conditions ◽  
System Parameters ◽  
Threaded Fasteners

Previous analyses of threaded fasteners under vibration are based on static equilibrium conditions with supporting data limited to low frequency loading. Such analyses predict only a net loosening action. This paper presents a dynamic model of a single-bolt assembly with moderate pre-load subjected to axial harmonic vibration. Simulations with this model predict that threaded fasteners can, on the average, loosen or tighten in the presence of vibration; and that the applied vibration, as well as other system parameters, can be tuned so that either action occurs. Measurements from a single-bolt assembly apparatus are presented and compared with the simulations.

scholarly journals Application of Particle Dampers on a Scaled Wind Turbine Generator to Improve Low-Frequency Vibro-Acoustic Behavior

2022 ◽  
Vol 12 (2) ◽  
pp. 671
Author(s):  
Braj Bhushan Prasad ◽  
Fabian Duvigneau ◽  
Daniel Juhre ◽  
Elmar Woschke
Keyword(s):  
Wind Turbine ◽  
Granular Materials ◽  
Laser Scanning ◽  
Low Frequency ◽  
Small Scale ◽  
Turbine Generator ◽  
Wind Turbine Generator ◽  
Low Frequency Vibration ◽  
Vibration Attenuation ◽  
Particle Damping

The purpose of this paper is to introduce a honeycomb damping plate (HCDP) concept based on the particle damping technique to reduce the low-frequency vibration response of wind turbine generators. The HCDP cells contain granular materials and are mounted at different positions on the generator to reduce the transmission of vibrations from stator ring to stator arm. To investigate the efficiency of the HCDP concept in the laboratory, a small-scale replica inspired by the original wind turbine generator is used as reference geometry. The efficiency of the vibration attenuation by using the HCDP concept is experimentally investigated with the help of a laser scanning vibrometer device. In this contribution, the influence of four different granular materials on the vibration attenuation is experimentally investigated. Furthermore, the influence of HCDP positioning on the transmission path damping is analyzed. Apart from this, the effect of single-unit (SU) and multi-unit (MU) HCDP on the frequency response of the generator is also studied. The experimental approach in this paper shows good damping properties of the HCDP concept for reducing the vibration amplitude.

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